dn_parent(" ") returns NULL
	dn2entry logs if dn2id returns id but id2entry doesn't return entry.

was never applied to -devel and hence doesn't need to be backed out.
NO ACTUAL CHANGES are associated with log entry

This change will be backed out of devel once imported into release engineering
branchs.

Mainly comment on 'read' privs and provide references to man pages

to return entry lock with e == NULL.

	shutdown without busy loop, explicit yield func no longer mandatory
	use pthread_detach() to detach threads (instead of creating them
		in a detached state)
	pthread_create error reporting
	moved declarations to init.c
Import configure changes:
	revamp res_search check
	remove strtok_r check

	build environment changes (for VPATH, lib orderring)
	test script changes (for VPATH)
	doc updates